Permit guide · Building Permit
Building permits are the approval path your local AHJ uses to check zoning, code, documents, contractor rules, fees, and inspections before construction starts. The exact process changes by address, project type, and local amendments, so the safest first step is identifying the reviewing jurisdiction and the permit package it expects.
What this guide checks
AHJ, zoning, documents, fees, inspections
Enter your address to find your building department, then answer a few questions to see if you likely need a permit.
What's an AHJ?
The specific city, village, or county office that issues permits. Their boundaries don't always match your mailing address.
GPS-verified
We cross-check your coordinates against municipal boundary polygons, not just ZIP codes.
Wrong AHJ = weeks lost
Filing with the wrong building department means your application sits unreviewed.
The short answer
To get a building permit, you usually identify the AHJ, confirm whether zoning review applies, prepare a site plan or construction drawings, submit the application, pay fees, answer reviewer comments, and schedule inspection steps after approval. Small repairs may be exempt, but new structures, additions, structural changes, major remodels, trade work, and occupancy changes commonly require building permits.
What we check
The first question is who reviews the work. A city, village, township, county, or special district may control the permit. The project scope then determines whether the package needs building, zoning, electrical, plumbing, mechanical, or other trade review.
Many building permits start with zoning. Reviewers may check setbacks, lot coverage, height, easements, floodplain limits, historic districts, accessory structure rules, and whether the proposed use is allowed at the address.
A site plan shows the lot, existing structures, proposed work, dimensions, distances to property lines, driveways, utilities, and other constraints. Larger projects can also need floor plans, elevations, framing details, energy forms, or engineering.
Some AHJs let homeowners pull permits for work on their own residence. Others require licensed or registered contractors, bonds, insurance certificates, notarized owner affidavits, or subcontractor lists before review can start.
Fees may be flat, valuation-based, square-foot based, or split across building and zoning departments. If the reviewer finds missing information, the permit pauses until corrected plans, forms, or contractor details are submitted.
Approval is not the last step. Many projects require inspection milestones such as footing, framing, rough trades, insulation, final building, and certificate of occupancy or completion. Work that gets covered before inspection can create expensive rework.
Process
The slowest permit applications usually fail before submission: wrong AHJ, no zoning check, missing site plan dimensions, unregistered contractor, unclear scope, or drawings that do not match the actual project. A clean first package is often faster than a rushed application that triggers corrections.
Per state
IL
Illinois permitting is highly local. Chicago, suburbs, townships, and counties can each use different forms, contractor registration rules, zoning checks, and inspection procedures.
WI
Wisconsin projects can involve local permitting plus state residential code expectations. One- and two-family work may need UDC-aware review, local zoning approval, and scheduled inspections.
IN
Indiana permit requirements vary by city, county, and local code adoption. Some projects trigger county-level review, local zoning review, or separate trade permits depending on scope.
Watch for these
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